io.github.mindstone/mcp-server-retell-ai
Retell AI
Is the Retell AI MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-27.
Retell AI MCP server: voice agent phone calls, agent management, LLMs, and voice discovery
alive probed 2026-11-15 · unchanged since 2026-10-27
- Run it
- npx -y @mindstone/mcp-server-retell-ai@0.3.0 (stdio, probed in a container with the network off)
- Host
- npmjs.com
- Reports itself as
- retell-ai-mcp-server 0.3.0
- Capabilities
- tools
- Instructions
- 1 133 characters
- Of a 1M window
- 2.5 % of a 1M context window
- Count
- 25k tokens in Claude Opus 5.5, exact, measured 2026-10-27. With the Claude Code prefix mcp__…__ on each tool name: 25k. The o200k_base estimate is 14k. Counted again when the tool definitions change. Method.
- Repository
- https://github.com/mindstone/mcp-servers
- Registry
- active, updated 2026-08-05 · registry entry
- Changes
- 2 recorded, reachable in 2 of them. A row is added when the result, the tool count or the cost changes.
Most expensive tools
The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.72×.
| Tool | ≈ Claude tokens | o200k estimate | Share of this server |
|---|---|---|---|
| create_batch_call | 2 340 | 1 363 | 10 % |
| create_phone_call | 1 550 | 903 | 6 % |
| update_retell_llm | 1 485 | 865 | 6 % |
| create_knowledge_base | 1 246 | 726 | 5 % |
| update_agent | 1 147 | 668 | 5 % |
Compare this server with others.
More servers
Other registry entries on npmjs.com, the ones next to this name; all of them.
- Outreach io.github.mindstone/mcp-server-outreach · alive
- PandaDoc io.github.mindstone/mcp-server-pandadoc · alive
- QuickBooks Online io.github.mindstone/mcp-server-quickbooks · alive
- Replit SSH io.github.mindstone/mcp-server-replit-ssh · alive
- Runway ML io.github.mindstone/mcp-server-runway · alive
- Salesforce io.github.mindstone/mcp-server-salesforce · alive
- ServiceNow io.github.mindstone/mcp-server-servicenow · alive
- Slack io.github.mindstone/mcp-server-slack · alive
Servers that mention retell or management or discovery.
- com.topness/callwright · not probed
- io.github.topness-msft/callwright · not probed
- ai.adoraads/beauty · alive
- AFMR Discovery ai.afmr/discovery · alive
- Teamwork ai.b77/teamwork · needs auth
- China Marketing AI Intelligence MCP ai.chinamarketing/intelligence · needs auth
- Cirra AI Salesforce Admin MCP Server ai.cirra/salesforce-mcp · needs auth
- Contabo (VPS) MCP Server ai.com.mcp/contabo · alive
History
We add a row when the result changes. A server with no change keeps its last row.
| Probed | Result | Init | Tools | Claude | o200k |
|---|---|---|---|---|---|
| 2026-10-27 06:57 | alive | 326 ms | 32 | 25k | 14k |
| 2026-10-20 06:44 | alive | 406 ms | 32 | 14k |
Badge for the README
The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.
A mail when this server changes
Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.
For the publisher
- This server is in the heaviest 10 % of the registry. Its 5 most expensive tools are 32 % of the cost. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.